/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * * GPL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved * Use is subject to license terms. */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. */ #define DEBUG_SUBSYSTEM S_RPC #ifndef __KERNEL__ #include #include #include #endif #include #include #include #include #include #include #include "ptlrpc_internal.h" void ptlrpc_init_client(int req_portal, int rep_portal, char *name, struct ptlrpc_client *cl) { cl->cli_request_portal = req_portal; cl->cli_reply_portal = rep_portal; cl->cli_name = name; } struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid) { struct ptlrpc_connection *c; lnet_nid_t self; lnet_process_id_t peer; int err; err = ptlrpc_uuid_to_peer(uuid, &peer, &self); if (err != 0) { CERROR("cannot find peer %s!\n", uuid->uuid); return NULL; } c = ptlrpc_connection_get(peer, self, uuid); if (c) { memcpy(c->c_remote_uuid.uuid, uuid->uuid, sizeof(c->c_remote_uuid.uuid)); } CDEBUG(D_INFO, "%s -> %p\n", uuid->uuid, c); return c; } static inline struct ptlrpc_bulk_desc *new_bulk(int npages, int type, int portal) { struct ptlrpc_bulk_desc *desc; OBD_ALLOC(desc, offsetof (struct ptlrpc_bulk_desc, bd_iov[npages])); if (!desc) return NULL; spin_lock_init(&desc->bd_lock); cfs_waitq_init(&desc->bd_waitq); desc->bd_max_iov = npages; desc->bd_iov_count = 0; LNetInvalidateHandle(&desc->bd_md_h); desc->bd_portal = portal; desc->bd_type = type; return desc; } struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp (struct ptlrpc_request *req, int npages, int type, int portal) { struct obd_import *imp = req->rq_import; struct ptlrpc_bulk_desc *desc; ENTRY; LASSERT(type == BULK_PUT_SINK || type == BULK_GET_SOURCE); desc = new_bulk(npages, type, portal); if (desc == NULL) RETURN(NULL); desc->bd_import_generation = req->rq_import_generation; desc->bd_import = class_import_get(imp); desc->bd_req = req; desc->bd_cbid.cbid_fn = client_bulk_callback; desc->bd_cbid.cbid_arg = desc; /* This makes req own desc, and free it when she frees herself */ req->rq_bulk = desc; return desc; } struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req, int npages, int type, int portal) { struct obd_export *exp = req->rq_export; struct ptlrpc_bulk_desc *desc; ENTRY; LASSERT(type == BULK_PUT_SOURCE || type == BULK_GET_SINK); desc = new_bulk(npages, type, portal); if (desc == NULL) RETURN(NULL); desc->bd_export = class_export_get(exp); desc->bd_req = req; desc->bd_cbid.cbid_fn = server_bulk_callback; desc->bd_cbid.cbid_arg = desc; /* NB we don't assign rq_bulk here; server-side requests are * re-used, and the handler frees the bulk desc explicitly. */ return desc; } void ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc, cfs_page_t *page, int pageoffset, int len) { LASSERT(desc->bd_iov_count < desc->bd_max_iov); LASSERT(page != NULL); LASSERT(pageoffset >= 0); LASSERT(len > 0); LASSERT(pageoffset + len <= CFS_PAGE_SIZE); desc->bd_nob += len; ptlrpc_add_bulk_page(desc, page, pageoffset, len); } void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc) { ENTRY; LASSERT(desc != NULL); LASSERT(desc->bd_iov_count != LI_POISON); /* not freed already */ LASSERT(!desc->bd_network_rw); /* network hands off or */ LASSERT((desc->bd_export != NULL) ^ (desc->bd_import != NULL)); sptlrpc_enc_pool_put_pages(desc); if (desc->bd_export) class_export_put(desc->bd_export); else class_import_put(desc->bd_import); OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc, bd_iov[desc->bd_max_iov])); EXIT; } /* Set server timelimit for this req */ void ptlrpc_at_set_req_timeout(struct ptlrpc_request *req) { __u32 serv_est; int idx; struct imp_at *at; LASSERT(req->rq_import); if (AT_OFF) { /* non-AT settings */ req->rq_timeout = req->rq_import->imp_server_timeout ? obd_timeout / 2 : obd_timeout; lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout); return; } at = &req->rq_import->imp_at; idx = import_at_get_index(req->rq_import, req->rq_request_portal); serv_est = at_get(&at->iat_service_estimate[idx]); req->rq_timeout = at_est2timeout(serv_est); /* We could get even fancier here, using history to predict increased loading... */ /* Let the server know what this RPC timeout is by putting it in the reqmsg*/ lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout); } /* Adjust max service estimate based on server value */ static void ptlrpc_at_adj_service(struct ptlrpc_request *req, unsigned int serv_est) { int idx; unsigned int oldse; struct imp_at *at; /* do estimate only if is not in recovery */ if (!(req->rq_send_state & (LUSTRE_IMP_FULL | LUSTRE_IMP_CONNECTING))) return; LASSERT(req->rq_import); at = &req->rq_import->imp_at; idx = import_at_get_index(req->rq_import, req->rq_request_portal); /* max service estimates are tracked on the server side, so just keep minimal history here */ oldse = at_add(&at->iat_service_estimate[idx], serv_est); if (oldse != 0) CDEBUG(D_ADAPTTO, "The RPC service estimate for %s ptl %d " "has changed from %d to %d\n", req->rq_import->imp_obd->obd_name,req->rq_request_portal, oldse, at_get(&at->iat_service_estimate[idx])); } /* Expected network latency per remote node (secs) */ int ptlrpc_at_get_net_latency(struct ptlrpc_request *req) { return AT_OFF ? 0 : at_get(&req->rq_import->imp_at.iat_net_latency); } /* Adjust expected network latency */ static void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req, unsigned int service_time) { unsigned int nl, oldnl; struct imp_at *at; time_t now = cfs_time_current_sec(); LASSERT(req->rq_import); at = &req->rq_import->imp_at; /* Network latency is total time less server processing time */ nl = max_t(int, now - req->rq_sent - service_time, 0) +1/*st rounding*/; if (service_time > now - req->rq_sent + 3 /* bz16408 */) CWARN("Reported service time %u > total measured time " CFS_DURATION_T"\n", service_time, cfs_time_sub(now, req->rq_sent)); oldnl = at_add(&at->iat_net_latency, nl); if (oldnl != 0) CDEBUG(D_ADAPTTO, "The network latency for %s (nid %s) " "has changed from %d to %d\n", req->rq_import->imp_obd->obd_name, obd_uuid2str( &req->rq_import->imp_connection->c_remote_uuid), oldnl, at_get(&at->iat_net_latency)); } static int unpack_reply(struct ptlrpc_request *req) { int rc; /* Clear reply swab mask; we may have already swabbed an early reply */ req->rq_rep_swab_mask = 0; rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen); if (rc) { DEBUG_REQ(D_ERROR, req, "unpack_rep failed: %d", rc); return(-EPROTO); } rc = lustre_unpack_rep_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF); if (rc) { DEBUG_REQ(D_ERROR, req, "unpack ptlrpc body failed: %d", rc); return(-EPROTO); } return 0; } /* * Handle an early reply message, called with the rq_lock held. * If anything goes wrong just ignore it - same as if it never happened */ static int ptlrpc_at_recv_early_reply(struct ptlrpc_request *req) { struct ptlrpc_request *early_req; time_t olddl; int rc; ENTRY; req->rq_early = 0; spin_unlock(&req->rq_lock); rc = sptlrpc_cli_unwrap_early_reply(req, &early_req); if (rc) { spin_lock(&req->rq_lock); RETURN(rc); } rc = unpack_reply(early_req); if (rc == 0) { /* Expecting to increase the service time estimate here */ ptlrpc_at_adj_service(req, lustre_msg_get_timeout(early_req->rq_repmsg)); ptlrpc_at_adj_net_latency(req, lustre_msg_get_service_time(early_req->rq_repmsg)); } sptlrpc_cli_finish_early_reply(early_req); spin_lock(&req->rq_lock); if (rc == 0) { /* Adjust the local timeout for this req */ ptlrpc_at_set_req_timeout(req); olddl = req->rq_deadline; /* server assumes it now has rq_timeout from when it sent the early reply, so client should give it at least that long. */ req->rq_deadline = cfs_time_current_sec() + req->rq_timeout + ptlrpc_at_get_net_latency(req); DEBUG_REQ(D_ADAPTTO, req, "Early reply #%d, new deadline in "CFS_DURATION_T"s " "("CFS_DURATION_T"s)", req->rq_early_count, cfs_time_sub(req->rq_deadline, cfs_time_current_sec()), cfs_time_sub(req->rq_deadline, olddl)); } RETURN(rc); } void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool) { struct list_head *l, *tmp; struct ptlrpc_request *req; LASSERT(pool != NULL); spin_lock(&pool->prp_lock); list_for_each_safe(l, tmp, &pool->prp_req_list) { req = list_entry(l, struct ptlrpc_request, rq_list); list_del(&req->rq_list); LASSERT(req->rq_reqbuf); LASSERT(req->rq_reqbuf_len == pool->prp_rq_size); OBD_FREE(req->rq_reqbuf, pool->prp_rq_size); OBD_FREE(req, sizeof(*req)); } spin_unlock(&pool->prp_lock); OBD_FREE(pool, sizeof(*pool)); } void ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq) { int i; int size = 1; while (size < pool->prp_rq_size + SPTLRPC_MAX_PAYLOAD) size <<= 1; LASSERTF(list_empty(&pool->prp_req_list) || size == pool->prp_rq_size, "Trying to change pool size with nonempty pool " "from %d to %d bytes\n", pool->prp_rq_size, size); spin_lock(&pool->prp_lock); pool->prp_rq_size = size; for (i = 0; i < num_rq; i++) { struct ptlrpc_request *req; struct lustre_msg *msg; spin_unlock(&pool->prp_lock); OBD_ALLOC(req, sizeof(struct ptlrpc_request)); if (!req) return; OBD_ALLOC_GFP(msg, size, CFS_ALLOC_STD); if (!msg) { OBD_FREE(req, sizeof(struct ptlrpc_request)); return; } req->rq_reqbuf = msg; req->rq_reqbuf_len = size; req->rq_pool = pool; spin_lock(&pool->prp_lock); list_add_tail(&req->rq_list, &pool->prp_req_list); } spin_unlock(&pool->prp_lock); return; } struct ptlrpc_request_pool * ptlrpc_init_rq_pool(int num_rq, int msgsize, void (*populate_pool)(struct ptlrpc_request_pool *, int)) { struct ptlrpc_request_pool *pool; OBD_ALLOC(pool, sizeof (struct ptlrpc_request_pool)); if (!pool) return NULL; /* Request next power of two for the allocation, because internally kernel would do exactly this */ spin_lock_init(&pool->prp_lock); CFS_INIT_LIST_HEAD(&pool->prp_req_list); pool->prp_rq_size = msgsize; pool->prp_populate = populate_pool; populate_pool(pool, num_rq); if (list_empty(&pool->prp_req_list)) { /* have not allocated a single request for the pool */ OBD_FREE(pool, sizeof (struct ptlrpc_request_pool)); pool = NULL; } return pool; } static struct ptlrpc_request * ptlrpc_prep_req_from_pool(struct ptlrpc_request_pool *pool) { struct ptlrpc_request *request; struct lustre_msg *reqbuf; if (!pool) return NULL; spin_lock(&pool->prp_lock); /* See if we have anything in a pool, and bail out if nothing, * in writeout path, where this matters, this is safe to do, because * nothing is lost in this case, and when some in-flight requests * complete, this code will be called again. */ if (unlikely(list_empty(&pool->prp_req_list))) { spin_unlock(&pool->prp_lock); return NULL; } request = list_entry(pool->prp_req_list.next, struct ptlrpc_request, rq_list); list_del_init(&request->rq_list); spin_unlock(&pool->prp_lock); LASSERT(request->rq_reqbuf); LASSERT(request->rq_pool); reqbuf = request->rq_reqbuf; memset(request, 0, sizeof(*request)); request->rq_reqbuf = reqbuf; request->rq_reqbuf_len = pool->prp_rq_size; request->rq_pool = pool; return request; } static void __ptlrpc_free_req_to_pool(struct ptlrpc_request *request) { struct ptlrpc_request_pool *pool = request->rq_pool; spin_lock(&pool->prp_lock); LASSERT(list_empty(&request->rq_list)); LASSERT(!request->rq_receiving_reply); list_add_tail(&request->rq_list, &pool->prp_req_list); spin_unlock(&pool->prp_lock); } static int __ptlrpc_request_bufs_pack(struct ptlrpc_request *request, __u32 version, int opcode, int count, __u32 *lengths, char **bufs, struct ptlrpc_cli_ctx *ctx) { struct obd_import *imp = request->rq_import; int rc; ENTRY; if (unlikely(ctx)) request->rq_cli_ctx = sptlrpc_cli_ctx_get(ctx); else { rc = sptlrpc_req_get_ctx(request); if (rc) GOTO(out_free, rc); } sptlrpc_req_set_flavor(request, opcode); rc = lustre_pack_request(request, imp->imp_msg_magic, count, lengths, bufs); if (rc) { LASSERT(!request->rq_pool); GOTO(out_ctx, rc); } lustre_msg_add_version(request->rq_reqmsg, version); request->rq_send_state = LUSTRE_IMP_FULL; request->rq_type = PTL_RPC_MSG_REQUEST; request->rq_export = NULL; request->rq_req_cbid.cbid_fn = request_out_callback; request->rq_req_cbid.cbid_arg = request; request->rq_reply_cbid.cbid_fn = reply_in_callback; request->rq_reply_cbid.cbid_arg = request; request->rq_reply_deadline = 0; request->rq_phase = RQ_PHASE_NEW; request->rq_next_phase = RQ_PHASE_UNDEFINED; request->rq_request_portal = imp->imp_client->cli_request_portal; request->rq_reply_portal = imp->imp_client->cli_reply_portal; ptlrpc_at_set_req_timeout(request); spin_lock_init(&request->rq_lock); CFS_INIT_LIST_HEAD(&request->rq_list); CFS_INIT_LIST_HEAD(&request->rq_timed_list); CFS_INIT_LIST_HEAD(&request->rq_replay_list); CFS_INIT_LIST_HEAD(&request->rq_mod_list); CFS_INIT_LIST_HEAD(&request->rq_ctx_chain); CFS_INIT_LIST_HEAD(&request->rq_set_chain); CFS_INIT_LIST_HEAD(&request->rq_history_list); cfs_waitq_init(&request->rq_reply_waitq); request->rq_xid = ptlrpc_next_xid(); atomic_set(&request->rq_refcount, 1); lustre_msg_set_opc(request->rq_reqmsg, opcode); RETURN(0); out_ctx: sptlrpc_cli_ctx_put(request->rq_cli_ctx, 1); out_free: class_import_put(imp); return rc; } int ptlrpc_request_bufs_pack(struct ptlrpc_request *request, __u32 version, int opcode, char **bufs, struct ptlrpc_cli_ctx *ctx) { int count; count = req_capsule_filled_sizes(&request->rq_pill, RCL_CLIENT); return __ptlrpc_request_bufs_pack(request, version, opcode, count, request->rq_pill.rc_area[RCL_CLIENT], bufs, ctx); } EXPORT_SYMBOL(ptlrpc_request_bufs_pack); int ptlrpc_request_pack(struct ptlrpc_request *request, __u32 version, int opcode) { return ptlrpc_request_bufs_pack(request, version, opcode, NULL, NULL); } static inline struct ptlrpc_request *__ptlrpc_request_alloc(struct obd_import *imp, struct ptlrpc_request_pool *pool) { struct ptlrpc_request *request = NULL; if (pool) request = ptlrpc_prep_req_from_pool(pool); if (!request) OBD_ALLOC_PTR(request); if (request) { LASSERTF((unsigned long)imp > 0x1000, "%p", imp); LASSERT(imp != LP_POISON); LASSERTF((unsigned long)imp->imp_client > 0x1000, "%p", imp->imp_client); LASSERT(imp->imp_client != LP_POISON); request->rq_import = class_import_get(imp); } else { CERROR("request allocation out of memory\n"); } return request; } static struct ptlrpc_request * ptlrpc_request_alloc_internal(struct obd_import *imp, struct ptlrpc_request_pool * pool, const struct req_format *format) { struct ptlrpc_request *request; request = __ptlrpc_request_alloc(imp, pool); if (request == NULL) return NULL; req_capsule_init(&request->rq_pill, request, RCL_CLIENT); req_capsule_set(&request->rq_pill, format); return request; } struct ptlrpc_request *ptlrpc_request_alloc(struct obd_import *imp, const struct req_format *format) { return ptlrpc_request_alloc_internal(imp, NULL, format); } struct ptlrpc_request *ptlrpc_request_alloc_pool(struct obd_import *imp, struct ptlrpc_request_pool * pool, const struct req_format *format) { return ptlrpc_request_alloc_internal(imp, pool, format); } void ptlrpc_request_free(struct ptlrpc_request *request) { if (request->rq_pool) __ptlrpc_free_req_to_pool(request); else OBD_FREE_PTR(request); } struct ptlrpc_request *ptlrpc_request_alloc_pack(struct obd_import *imp, const struct req_format *format, __u32 version, int opcode) { struct ptlrpc_request *req = ptlrpc_request_alloc(imp, format); int rc; if (req) { rc = ptlrpc_request_pack(req, version, opcode); if (rc) { ptlrpc_request_free(req); req = NULL; } } return req; } struct ptlrpc_request * ptlrpc_prep_req_pool(struct obd_import *imp, __u32 version, int opcode, int count, __u32 *lengths, char **bufs, struct ptlrpc_request_pool *pool) { struct ptlrpc_request *request; int rc; request = __ptlrpc_request_alloc(imp, pool); if (!request) return NULL; rc = __ptlrpc_request_bufs_pack(request, version, opcode, count, lengths, bufs, NULL); if (rc) { ptlrpc_request_free(request); request = NULL; } return request; } struct ptlrpc_request * ptlrpc_prep_req(struct obd_import *imp, __u32 version, int opcode, int count, __u32 *lengths, char **bufs) { return ptlrpc_prep_req_pool(imp, version, opcode, count, lengths, bufs, NULL); } struct ptlrpc_request_set *ptlrpc_prep_set(void) { struct ptlrpc_request_set *set; ENTRY; OBD_ALLOC(set, sizeof *set); if (!set) RETURN(NULL); CFS_INIT_LIST_HEAD(&set->set_requests); cfs_waitq_init(&set->set_waitq); set->set_remaining = 0; spin_lock_init(&set->set_new_req_lock); CFS_INIT_LIST_HEAD(&set->set_new_requests); CFS_INIT_LIST_HEAD(&set->set_cblist); RETURN(set); } /* Finish with this set; opposite of prep_set. */ void ptlrpc_set_destroy(struct ptlrpc_request_set *set) { struct list_head *tmp; struct list_head *next; int expected_phase; int n = 0; ENTRY; /* Requests on the set should either all be completed, or all be new */ expected_phase = (set->set_remaining == 0) ? RQ_PHASE_COMPLETE : RQ_PHASE_NEW; list_for_each (tmp, &set->set_requests) { struct ptlrpc_request *req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); LASSERT(req->rq_phase == expected_phase); n++; } LASSERT(set->set_remaining == 0 || set->set_remaining == n); list_for_each_safe(tmp, next, &set->set_requests) { struct ptlrpc_request *req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); list_del_init(&req->rq_set_chain); LASSERT(req->rq_phase == expected_phase); if (req->rq_phase == RQ_PHASE_NEW) { if (req->rq_interpret_reply != NULL) { ptlrpc_interpterer_t interpreter = req->rq_interpret_reply; /* higher level (i.e. LOV) failed; * let the sub reqs clean up */ req->rq_status = -EBADR; interpreter(NULL, req, &req->rq_async_args, req->rq_status); } set->set_remaining--; } req->rq_set = NULL; ptlrpc_req_finished (req); } LASSERT(set->set_remaining == 0); OBD_FREE(set, sizeof(*set)); EXIT; } int ptlrpc_set_add_cb(struct ptlrpc_request_set *set, set_interpreter_func fn, void *data) { struct ptlrpc_set_cbdata *cbdata; OBD_ALLOC_PTR(cbdata); if (cbdata == NULL) RETURN(-ENOMEM); cbdata->psc_interpret = fn; cbdata->psc_data = data; list_add_tail(&cbdata->psc_item, &set->set_cblist); RETURN(0); } void ptlrpc_set_add_req(struct ptlrpc_request_set *set, struct ptlrpc_request *req) { /* The set takes over the caller's request reference */ list_add_tail(&req->rq_set_chain, &set->set_requests); req->rq_set = set; set->set_remaining++; } /** * Lock so many callers can add things, the context that owns the set * is supposed to notice these and move them into the set proper. */ int ptlrpc_set_add_new_req(struct ptlrpcd_ctl *pc, struct ptlrpc_request *req) { struct ptlrpc_request_set *set = pc->pc_set; /* * Let caller know that we stopped and will not handle this request. * It needs to take care itself of request. */ if (test_bit(LIOD_STOP, &pc->pc_flags)) return -EALREADY; spin_lock(&set->set_new_req_lock); /* * The set takes over the caller's request reference. */ list_add_tail(&req->rq_set_chain, &set->set_new_requests); req->rq_set = set; spin_unlock(&set->set_new_req_lock); /* * Let thead know that we added something and better it to wake up * and process. */ cfs_waitq_signal(&set->set_waitq); return 0; } /* * Based on the current state of the import, determine if the request * can be sent, is an error, or should be delayed. * * Returns true if this request should be delayed. If false, and * *status is set, then the request can not be sent and *status is the * error code. If false and status is 0, then request can be sent. * * The imp->imp_lock must be held. */ static int ptlrpc_import_delay_req(struct obd_import *imp, struct ptlrpc_request *req, int *status) { int delay = 0; ENTRY; LASSERT (status != NULL); *status = 0; if (req->rq_ctx_init || req->rq_ctx_fini) { /* always allow ctx init/fini rpc go through */ } else if (imp->imp_state == LUSTRE_IMP_NEW) { DEBUG_REQ(D_ERROR, req, "Uninitialized import."); *status = -EIO; LBUG(); } else if (imp->imp_state == LUSTRE_IMP_CLOSED) { DEBUG_REQ(D_ERROR, req, "IMP_CLOSED "); *status = -EIO; } else if (req->rq_send_state == LUSTRE_IMP_CONNECTING && imp->imp_state == LUSTRE_IMP_CONNECTING) { /* allow CONNECT even if import is invalid */ ; if (atomic_read(&imp->imp_inval_count) != 0) { DEBUG_REQ(D_ERROR, req, "invalidate in flight"); *status = -EIO; } } else if ((imp->imp_invalid && (!imp->imp_recon_bk)) || imp->imp_obd->obd_no_recov) { /* If the import has been invalidated (such as by an OST * failure), and if the import(MGC) tried all of its connection * list (Bug 13464), the request must fail with -ESHUTDOWN. * This indicates the requests should be discarded; an -EIO * may result in a resend of the request. */ if (!imp->imp_deactive) DEBUG_REQ(D_ERROR, req, "IMP_INVALID"); *status = -ESHUTDOWN; /* bz 12940 */ } else if (req->rq_import_generation != imp->imp_generation) { DEBUG_REQ(D_ERROR, req, "req wrong generation:"); *status = -EIO; } else if (req->rq_send_state != imp->imp_state) { /* invalidate in progress - any requests should be drop */ if (atomic_read(&imp->imp_inval_count) != 0) { DEBUG_REQ(D_ERROR, req, "invalidate in flight"); *status = -EIO; } else if (imp->imp_dlm_fake || req->rq_no_delay) { *status = -EWOULDBLOCK; } else { delay = 1; } } RETURN(delay); } static int ptlrpc_check_reply(struct ptlrpc_request *req) { int rc = 0; ENTRY; /* serialise with network callback */ spin_lock(&req->rq_lock); if (ptlrpc_client_replied(req)) GOTO(out, rc = 1); if (req->rq_net_err && !req->rq_timedout) { spin_unlock(&req->rq_lock); rc = ptlrpc_expire_one_request(req, 0); spin_lock(&req->rq_lock); GOTO(out, rc); } if (req->rq_err) GOTO(out, rc = 1); if (req->rq_resend) GOTO(out, rc = 1); if (req->rq_restart) GOTO(out, rc = 1); if (ptlrpc_client_early(req)) { ptlrpc_at_recv_early_reply(req); GOTO(out, rc = 0); /* keep waiting */ } EXIT; out: spin_unlock(&req->rq_lock); DEBUG_REQ(D_NET, req, "rc = %d for", rc); return rc; } static int ptlrpc_check_status(struct ptlrpc_request *req) { int err; ENTRY; err = lustre_msg_get_status(req->rq_repmsg); if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) { struct obd_import *imp = req->rq_import; __u32 opc = lustre_msg_get_opc(req->rq_reqmsg); LCONSOLE_ERROR_MSG(0x011,"an error occurred while communicating" " with %s. The %s operation failed with %d\n", libcfs_nid2str(imp->imp_connection->c_peer.nid), ll_opcode2str(opc), err); RETURN(err < 0 ? err : -EINVAL); } if (err < 0) { DEBUG_REQ(D_INFO, req, "status is %d", err); } else if (err > 0) { /* XXX: translate this error from net to host */ DEBUG_REQ(D_INFO, req, "status is %d", err); } RETURN(err); } /** * Callback function called when client receives RPC reply for \a req. */ static int after_reply(struct ptlrpc_request *req) { struct obd_import *imp = req->rq_import; struct obd_device *obd = req->rq_import->imp_obd; int rc; struct timeval work_start; long timediff; ENTRY; LASSERT(!req->rq_receiving_reply); LASSERT(obd); LASSERT(req->rq_nob_received <= req->rq_repbuf_len); /* * NB Until this point, the whole of the incoming message, * including buflens, status etc is in the sender's byte order. */ rc = sptlrpc_cli_unwrap_reply(req); if (rc) { DEBUG_REQ(D_ERROR, req, "unwrap reply failed (%d):", rc); RETURN(rc); } /* * Security layer unwrap might ask resend this request. */ if (req->rq_resend) RETURN(0); rc = unpack_reply(req); if (rc) RETURN(rc); do_gettimeofday(&work_start); timediff = cfs_timeval_sub(&work_start, &req->rq_arrival_time, NULL); if (obd->obd_svc_stats != NULL) lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR, timediff); if (lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_REPLY && lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_ERR) { DEBUG_REQ(D_ERROR, req, "invalid packet received (type=%u)", lustre_msg_get_type(req->rq_repmsg)); RETURN(-EPROTO); } OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_PAUSE_REP, obd_fail_val); ptlrpc_at_adj_service(req, lustre_msg_get_timeout(req->rq_repmsg)); ptlrpc_at_adj_net_latency(req, lustre_msg_get_service_time(req->rq_repmsg)); rc = ptlrpc_check_status(req); imp->imp_connect_error = rc; if (rc) { /* * Either we've been evicted, or the server has failed for * some reason. Try to reconnect, and if that fails, punt to * the upcall. */ if (ll_rpc_recoverable_error(rc)) { if (req->rq_send_state != LUSTRE_IMP_FULL || imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) { RETURN(rc); } ptlrpc_request_handle_notconn(req); RETURN(rc); } } else { /* * Let's look if server sent slv. Do it only for RPC with * rc == 0. */ ldlm_cli_update_pool(req); } /* * Store transno in reqmsg for replay. */ req->rq_transno = lustre_msg_get_transno(req->rq_repmsg); lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno); if (req->rq_import->imp_replayable) { spin_lock(&imp->imp_lock); /* * No point in adding already-committed requests to the replay * list, we will just remove them immediately. b=9829 */ if (req->rq_transno != 0 && (req->rq_transno > lustre_msg_get_last_committed(req->rq_repmsg) || req->rq_replay)) ptlrpc_retain_replayable_request(req, imp); else if (req->rq_commit_cb != NULL) { spin_unlock(&imp->imp_lock); req->rq_commit_cb(req); spin_lock(&imp->imp_lock); } /* * Replay-enabled imports return commit-status information. */ if (lustre_msg_get_last_committed(req->rq_repmsg)) { imp->imp_peer_committed_transno = lustre_msg_get_last_committed(req->rq_repmsg); } ptlrpc_free_committed(imp); spin_unlock(&imp->imp_lock); } RETURN(rc); } static int ptlrpc_send_new_req(struct ptlrpc_request *req) { struct obd_import *imp; int rc; ENTRY; LASSERT(req->rq_phase == RQ_PHASE_NEW); if (req->rq_sent && (req->rq_sent > cfs_time_current_sec())) RETURN (0); ptlrpc_rqphase_move(req, RQ_PHASE_RPC); imp = req->rq_import; spin_lock(&imp->imp_lock); req->rq_import_generation = imp->imp_generation; if (ptlrpc_import_delay_req(imp, req, &rc)) { spin_lock(&req->rq_lock); req->rq_waiting = 1; spin_unlock(&req->rq_lock); DEBUG_REQ(D_HA, req, "req from PID %d waiting for recovery: " "(%s != %s)", lustre_msg_get_status(req->rq_reqmsg), ptlrpc_import_state_name(req->rq_send_state), ptlrpc_import_state_name(imp->imp_state)); LASSERT(list_empty(&req->rq_list)); list_add_tail(&req->rq_list, &imp->imp_delayed_list); atomic_inc(&req->rq_import->imp_inflight); spin_unlock(&imp->imp_lock); RETURN(0); } if (rc != 0) { spin_unlock(&imp->imp_lock); req->rq_status = rc; ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET); RETURN(rc); } LASSERT(list_empty(&req->rq_list)); list_add_tail(&req->rq_list, &imp->imp_sending_list); atomic_inc(&req->rq_import->imp_inflight); spin_unlock(&imp->imp_lock); lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid()); rc = sptlrpc_req_refresh_ctx(req, -1); if (rc) { if (req->rq_err) { req->rq_status = rc; RETURN(1); } else { req->rq_wait_ctx = 1; RETURN(0); } } CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc" " %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(), imp->imp_obd->obd_uuid.uuid, lustre_msg_get_status(req->rq_reqmsg), req->rq_xid, libcfs_nid2str(imp->imp_connection->c_peer.nid), lustre_msg_get_opc(req->rq_reqmsg)); rc = ptl_send_rpc(req, 0); if (rc) { DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc); req->rq_net_err = 1; RETURN(rc); } RETURN(0); } /* this sends any unsent RPCs in @set and returns TRUE if all are sent */ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set) { struct list_head *tmp; int force_timer_recalc = 0; ENTRY; if (set->set_remaining == 0) RETURN(1); list_for_each(tmp, &set->set_requests) { struct ptlrpc_request *req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); struct obd_import *imp = req->rq_import; int rc = 0; if (req->rq_phase == RQ_PHASE_NEW && ptlrpc_send_new_req(req)) { force_timer_recalc = 1; } /* delayed send - skip */ if (req->rq_phase == RQ_PHASE_NEW && req->rq_sent) continue; if (!(req->rq_phase == RQ_PHASE_RPC || req->rq_phase == RQ_PHASE_BULK || req->rq_phase == RQ_PHASE_INTERPRET || req->rq_phase == RQ_PHASE_UNREGISTERING || req->rq_phase == RQ_PHASE_COMPLETE)) { DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase); LBUG(); } if (req->rq_phase == RQ_PHASE_UNREGISTERING) { LASSERT(req->rq_next_phase != req->rq_phase); LASSERT(req->rq_next_phase != RQ_PHASE_UNDEFINED); /* * Skip processing until reply is unlinked. We * can't return to pool before that and we can't * call interpret before that. We need to make * sure that all rdma transfers finished and will * not corrupt any data. */ if (ptlrpc_client_recv_or_unlink(req)) continue; /* * Turn fail_loc off to prevent it from looping * forever. */ OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_LONG_UNLINK, OBD_FAIL_ONCE); /* * Move to next phase if reply was successfully * unlinked. */ ptlrpc_rqphase_move(req, req->rq_next_phase); } if (req->rq_phase == RQ_PHASE_COMPLETE) continue; if (req->rq_phase == RQ_PHASE_INTERPRET) GOTO(interpret, req->rq_status); /* * Note that this also will start async reply unlink. */ if (req->rq_net_err && !req->rq_timedout) { ptlrpc_expire_one_request(req, 1); /* * Check if we still need to wait for unlink. */ if (ptlrpc_client_recv_or_unlink(req)) continue; } if (req->rq_err) { req->rq_replied = 0; if (req->rq_status == 0) req->rq_status = -EIO; ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET); GOTO(interpret, req->rq_status); } /* ptlrpc_queue_wait->l_wait_event guarantees that rq_intr * will only be set after rq_timedout, but the synchronous IO * waiting path sets rq_intr irrespective of whether ptlrpcd * has seen a timeout. our policy is to only interpret * interrupted rpcs after they have timed out */ if (req->rq_intr && (req->rq_timedout || req->rq_waiting || req->rq_wait_ctx)) { req->rq_status = -EINTR; ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET); GOTO(interpret, req->rq_status); } if (req->rq_phase == RQ_PHASE_RPC) { if (req->rq_timedout || req->rq_resend || req->rq_waiting || req->rq_wait_ctx) { int status; if (!ptlrpc_unregister_reply(req, 1)) continue; spin_lock(&imp->imp_lock); if (ptlrpc_import_delay_req(imp, req, &status)){ spin_unlock(&imp->imp_lock); continue; } if (status != 0) { req->rq_status = status; ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET); spin_unlock(&imp->imp_lock); GOTO(interpret, req->rq_status); } if (req->rq_no_resend && !req->rq_wait_ctx) { req->rq_status = -ENOTCONN; ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET); spin_unlock(&imp->imp_lock); GOTO(interpret, req->rq_status); } list_del_init(&req->rq_list); list_add_tail(&req->rq_list, &imp->imp_sending_list); spin_unlock(&imp->imp_lock); req->rq_waiting = 0; if (req->rq_timedout||req->rq_resend) { /* This is re-sending anyways, * let's mark req as resend. */ req->rq_resend = 1; lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT); if (req->rq_bulk) { __u64 old_xid = req->rq_xid; ptlrpc_unregister_bulk(req); /* ensure previous bulk fails */ req->rq_xid = ptlrpc_next_xid(); CDEBUG(D_HA, "resend bulk " "old x"LPU64 " new x"LPU64"\n", old_xid, req->rq_xid); } } /* * rq_wait_ctx is only touched by ptlrpcd, * so no lock is needed here. */ status = sptlrpc_req_refresh_ctx(req, -1); if (status) { if (req->rq_err) { req->rq_status = status; force_timer_recalc = 1; } else { req->rq_wait_ctx = 1; } continue; } else { req->rq_wait_ctx = 0; } rc = ptl_send_rpc(req, 0); if (rc) { DEBUG_REQ(D_HA, req, "send failed (%d)", rc); force_timer_recalc = 1; req->rq_net_err = 1; } /* need to reset the timeout */ force_timer_recalc = 1; } spin_lock(&req->rq_lock); if (ptlrpc_client_early(req)) { ptlrpc_at_recv_early_reply(req); spin_unlock(&req->rq_lock); continue; } /* Still waiting for a reply? */ if (ptlrpc_client_recv(req)) { spin_unlock(&req->rq_lock); continue; } /* Did we actually receive a reply? */ if (!ptlrpc_client_replied(req)) { spin_unlock(&req->rq_lock); continue; } spin_unlock(&req->rq_lock); req->rq_status = after_reply(req); if (req->rq_resend) { /* Add this req to the delayed list so it can be errored if the import is evicted after recovery. */ spin_lock(&imp->imp_lock); list_del_init(&req->rq_list); list_add_tail(&req->rq_list, &imp->imp_delayed_list); spin_unlock(&imp->imp_lock); continue; } /* If there is no bulk associated with this request, * then we're done and should let the interpreter * process the reply. Similarly if the RPC returned * an error, and therefore the bulk will never arrive. */ if (req->rq_bulk == NULL || req->rq_status != 0) { ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET); GOTO(interpret, req->rq_status); } ptlrpc_rqphase_move(req, RQ_PHASE_BULK); } LASSERT(req->rq_phase == RQ_PHASE_BULK); if (ptlrpc_bulk_active(req->rq_bulk)) continue; if (!req->rq_bulk->bd_success) { /* The RPC reply arrived OK, but the bulk screwed * up! Dead wierd since the server told us the RPC * was good after getting the REPLY for her GET or * the ACK for her PUT. */ DEBUG_REQ(D_ERROR, req, "bulk transfer failed"); LBUG(); } ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET); interpret: LASSERT(req->rq_phase == RQ_PHASE_INTERPRET); /* This moves to "unregistering" phase we need to wait for * reply unlink. */ if (!ptlrpc_unregister_reply(req, 1)) continue; if (req->rq_bulk != NULL) ptlrpc_unregister_bulk(req); /* When calling interpret receiving already should be * finished. */ LASSERT(!req->rq_receiving_reply); if (req->rq_interpret_reply != NULL) { ptlrpc_interpterer_t interpreter = req->rq_interpret_reply; req->rq_status = interpreter(env, req, &req->rq_async_args, req->rq_status); } ptlrpc_rqphase_move(req, RQ_PHASE_COMPLETE); CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:" "opc %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(), imp->imp_obd->obd_uuid.uuid, lustre_msg_get_status(req->rq_reqmsg), req->rq_xid, libcfs_nid2str(imp->imp_connection->c_peer.nid), lustre_msg_get_opc(req->rq_reqmsg)); spin_lock(&imp->imp_lock); /* Request already may be not on sending or delaying list. This * may happen in the case of marking it errorneous for the case * ptlrpc_import_delay_req(req, status) find it impossible to * allow sending this rpc and returns *status != 0. */ if (!list_empty(&req->rq_list)) { list_del_init(&req->rq_list); atomic_dec(&imp->imp_inflight); } spin_unlock(&imp->imp_lock); set->set_remaining--; cfs_waitq_signal(&imp->imp_recovery_waitq); } /* If we hit an error, we want to recover promptly. */ RETURN(set->set_remaining == 0 || force_timer_recalc); } /* Return 1 if we should give up, else 0 */ int ptlrpc_expire_one_request(struct ptlrpc_request *req, int async_unlink) { struct obd_import *imp = req->rq_import; int rc = 0; ENTRY; DEBUG_REQ(D_ERROR|D_NETERROR, req, "%s (sent at "CFS_TIME_T", "CFS_DURATION_T"s ago)", req->rq_net_err ? "network error" : "timeout", req->rq_sent, cfs_time_sub(cfs_time_current_sec(), req->rq_sent)); if (imp) { LCONSOLE_WARN("Request x"LPU64" sent from %s to NID %s " CFS_DURATION_T"s ago has timed out " "(limit "CFS_DURATION_T"s).\n", req->rq_xid, req->rq_import->imp_obd->obd_name, libcfs_nid2str(imp->imp_connection->c_peer.nid), cfs_time_sub(cfs_time_current_sec(), req->rq_sent), cfs_time_sub(req->rq_deadline, req->rq_sent)); } if (imp != NULL && obd_debug_peer_on_timeout) LNetCtl(IOC_LIBCFS_DEBUG_PEER, &imp->imp_connection->c_peer); spin_lock(&req->rq_lock); req->rq_timedout = 1; spin_unlock(&req->rq_lock); ptlrpc_unregister_reply(req, async_unlink); if (obd_dump_on_timeout) libcfs_debug_dumplog(); if (req->rq_bulk != NULL) ptlrpc_unregister_bulk (req); if (imp == NULL) { DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?"); RETURN(1); } /* The DLM server doesn't want recovery run on its imports. */ if (imp->imp_dlm_fake) RETURN(1); /* If this request is for recovery or other primordial tasks, * then error it out here. */ if (req->rq_ctx_init || req->rq_ctx_fini || req->rq_send_state != LUSTRE_IMP_FULL || imp->imp_obd->obd_no_recov) { DEBUG_REQ(D_RPCTRACE, req, "err -110, sent_state=%s (now=%s)", ptlrpc_import_state_name(req->rq_send_state), ptlrpc_import_state_name(imp->imp_state)); spin_lock(&req->rq_lock); req->rq_status = -ETIMEDOUT; req->rq_err = 1; spin_unlock(&req->rq_lock); RETURN(1); } /* if a request can't be resent we can't wait for an answer after the timeout */ if (req->rq_no_resend) { DEBUG_REQ(D_RPCTRACE, req, "TIMEOUT-NORESEND:"); rc = 1; } ptlrpc_fail_import(imp, lustre_msg_get_conn_cnt(req->rq_reqmsg)); RETURN(rc); } int ptlrpc_expired_set(void *data) { struct ptlrpc_request_set *set = data; struct list_head *tmp; time_t now = cfs_time_current_sec(); ENTRY; LASSERT(set != NULL); /* * A timeout expired. See which reqs it applies to... */ list_for_each (tmp, &set->set_requests) { struct ptlrpc_request *req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); /* Request in-flight? */ if (!((req->rq_phase & (RQ_PHASE_RPC | RQ_PHASE_UNREGISTERING) && !req->rq_waiting && !req->rq_resend) || (req->rq_phase == RQ_PHASE_BULK))) continue; if (req->rq_timedout || /* already dealt with */ req->rq_deadline > now) /* not expired */ continue; /* Deal with this guy. Do it asynchronously to not block * ptlrpcd thread. */ ptlrpc_expire_one_request(req, 1); } /* * When waiting for a whole set, we always to break out of the * sleep so we can recalculate the timeout, or enable interrupts * if everyone's timed out. */ RETURN(1); } void ptlrpc_mark_interrupted(struct ptlrpc_request *req) { spin_lock(&req->rq_lock); req->rq_intr = 1; spin_unlock(&req->rq_lock); } void ptlrpc_interrupted_set(void *data) { struct ptlrpc_request_set *set = data; struct list_head *tmp; LASSERT(set != NULL); CERROR("INTERRUPTED SET %p\n", set); list_for_each(tmp, &set->set_requests) { struct ptlrpc_request *req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); if (req->rq_phase != RQ_PHASE_RPC && req->rq_phase != RQ_PHASE_UNREGISTERING) continue; ptlrpc_mark_interrupted(req); } } /** * Get the smallest timeout in the set; this does NOT set a timeout. */ int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set) { struct list_head *tmp; time_t now = cfs_time_current_sec(); int timeout = 0; struct ptlrpc_request *req; int deadline; ENTRY; SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */ list_for_each(tmp, &set->set_requests) { req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); /* * Request in-flight? */ if (!(((req->rq_phase & (RQ_PHASE_RPC | RQ_PHASE_UNREGISTERING)) && !req->rq_waiting) || (req->rq_phase == RQ_PHASE_BULK) || (req->rq_phase == RQ_PHASE_NEW))) continue; /* * Check those waiting for long reply unlink every one * second. */ if (req->rq_phase == RQ_PHASE_UNREGISTERING) { timeout = 1; break; } /* * Already timed out. */ if (req->rq_timedout) continue; /* * Waiting for ctx. */ if (req->rq_wait_ctx) continue; if (req->rq_phase == RQ_PHASE_NEW) deadline = req->rq_sent; else deadline = req->rq_sent + req->rq_timeout; if (deadline <= now) /* actually expired already */ timeout = 1; /* ASAP */ else if (timeout == 0 || timeout > deadline - now) timeout = deadline - now; } RETURN(timeout); } int ptlrpc_set_wait(struct ptlrpc_request_set *set) { struct list_head *tmp; struct ptlrpc_request *req; struct l_wait_info lwi; int rc, timeout; ENTRY; if (list_empty(&set->set_requests)) RETURN(0); list_for_each(tmp, &set->set_requests) { req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); if (req->rq_phase == RQ_PHASE_NEW) (void)ptlrpc_send_new_req(req); } do { timeout = ptlrpc_set_next_timeout(set); /* wait until all complete, interrupted, or an in-flight * req times out */ CDEBUG(D_RPCTRACE, "set %p going to sleep for %d seconds\n", set, timeout); lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(timeout ? timeout : 1), ptlrpc_expired_set, ptlrpc_interrupted_set, set); rc = l_wait_event(set->set_waitq, ptlrpc_check_set(NULL, set), &lwi); LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT); /* -EINTR => all requests have been flagged rq_intr so next * check completes. * -ETIMEOUTD => someone timed out. When all reqs have * timed out, signals are enabled allowing completion with * EINTR. * I don't really care if we go once more round the loop in * the error cases -eeb. */ } while (rc != 0 || set->set_remaining != 0); LASSERT(set->set_remaining == 0); rc = 0; list_for_each(tmp, &set->set_requests) { req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); LASSERT(req->rq_phase == RQ_PHASE_COMPLETE); if (req->rq_status != 0) rc = req->rq_status; } if (set->set_interpret != NULL) { int (*interpreter)(struct ptlrpc_request_set *set,void *,int) = set->set_interpret; rc = interpreter (set, set->set_arg, rc); } else { struct ptlrpc_set_cbdata *cbdata, *n; int err; list_for_each_entry_safe(cbdata, n, &set->set_cblist, psc_item) { list_del_init(&cbdata->psc_item); err = cbdata->psc_interpret(set, cbdata->psc_data, rc); if (err && !rc) rc = err; OBD_FREE_PTR(cbdata); } } RETURN(rc); } static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked) { ENTRY; if (request == NULL) { EXIT; return; } LASSERTF(!request->rq_receiving_reply, "req %p\n", request); LASSERTF(request->rq_rqbd == NULL, "req %p\n",request);/* client-side */ LASSERTF(list_empty(&request->rq_list), "req %p\n", request); LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request); LASSERTF(!request->rq_replay, "req %p\n", request); LASSERT(request->rq_cli_ctx); req_capsule_fini(&request->rq_pill); /* We must take it off the imp_replay_list first. Otherwise, we'll set * request->rq_reqmsg to NULL while osc_close is dereferencing it. */ if (request->rq_import != NULL) { if (!locked) spin_lock(&request->rq_import->imp_lock); list_del_init(&request->rq_mod_list); list_del_init(&request->rq_replay_list); if (!locked) spin_unlock(&request->rq_import->imp_lock); } LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request); if (atomic_read(&request->rq_refcount) != 0) { DEBUG_REQ(D_ERROR, request, "freeing request with nonzero refcount"); LBUG(); } if (request->rq_repbuf != NULL) sptlrpc_cli_free_repbuf(request); if (request->rq_export != NULL) { class_export_put(request->rq_export); request->rq_export = NULL; } if (request->rq_import != NULL) { class_import_put(request->rq_import); request->rq_import = NULL; } if (request->rq_bulk != NULL) ptlrpc_free_bulk(request->rq_bulk); if (request->rq_reqbuf != NULL || request->rq_clrbuf != NULL) sptlrpc_cli_free_reqbuf(request); sptlrpc_req_put_ctx(request, !locked); if (request->rq_pool) __ptlrpc_free_req_to_pool(request); else OBD_FREE(request, sizeof(*request)); EXIT; } static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked); void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request) { LASSERT_SPIN_LOCKED(&request->rq_import->imp_lock); (void)__ptlrpc_req_finished(request, 1); } static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked) { ENTRY; if (request == NULL) RETURN(1); if (request == LP_POISON || request->rq_reqmsg == LP_POISON) { CERROR("dereferencing freed request (bug 575)\n"); LBUG(); RETURN(1); } DEBUG_REQ(D_INFO, request, "refcount now %u", atomic_read(&request->rq_refcount) - 1); if (atomic_dec_and_test(&request->rq_refcount)) { __ptlrpc_free_req(request, locked); RETURN(1); } RETURN(0); } void ptlrpc_req_finished(struct ptlrpc_request *request) { __ptlrpc_req_finished(request, 0); } __u64 ptlrpc_req_xid(struct ptlrpc_request *request) { return request->rq_xid; } EXPORT_SYMBOL(ptlrpc_req_xid); /* Disengage the client's reply buffer from the network * NB does _NOT_ unregister any client-side bulk. * IDEMPOTENT, but _not_ safe against concurrent callers. * The request owner (i.e. the thread doing the I/O) must call... */ int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async) { int rc; cfs_waitq_t *wq; struct l_wait_info lwi; /* * Might sleep. */ LASSERT(!in_interrupt()); /* * Let's setup deadline for reply unlink. */ if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_UNLINK) && async && request->rq_reply_deadline == 0) request->rq_reply_deadline = cfs_time_current_sec()+LONG_UNLINK; /* * Nothing left to do. */ if (!ptlrpc_client_recv_or_unlink(request)) RETURN(1); LNetMDUnlink(request->rq_reply_md_h); /* * Let's check it once again. */ if (!ptlrpc_client_recv_or_unlink(request)) RETURN(1); /* * Move to "Unregistering" phase as reply was not unlinked yet. */ ptlrpc_rqphase_move(request, RQ_PHASE_UNREGISTERING); /* * Do not wait for unlink to finish. */ if (async) RETURN(0); /* * We have to l_wait_event() whatever the result, to give liblustre * a chance to run reply_in_callback(), and to make sure we've * unlinked before returning a req to the pool. */ if (request->rq_set != NULL) wq = &request->rq_set->set_waitq; else wq = &request->rq_reply_waitq; for (;;) { /* Network access will complete in finite time but the HUGE * timeout lets us CWARN for visibility of sluggish NALs */ lwi = LWI_TIMEOUT(cfs_time_seconds(LONG_UNLINK), NULL, NULL); rc = l_wait_event(*wq, !ptlrpc_client_recv_or_unlink(request), &lwi); if (rc == 0) { ptlrpc_rqphase_move(request, request->rq_next_phase); RETURN(1); } LASSERT(rc == -ETIMEDOUT); DEBUG_REQ(D_WARNING, request, "Unexpectedly long timeout " "rvcng=%d unlnk=%d", request->rq_receiving_reply, request->rq_must_unlink); } RETURN(0); } /* caller must hold imp->imp_lock */ void ptlrpc_free_committed(struct obd_import *imp) { struct list_head *tmp, *saved; struct ptlrpc_request *req; struct ptlrpc_request *last_req = NULL; /* temporary fire escape */ ENTRY; LASSERT(imp != NULL); LASSERT_SPIN_LOCKED(&imp->imp_lock); if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked && imp->imp_generation == imp->imp_last_generation_checked) { CDEBUG(D_RPCTRACE, "%s: skip recheck: last_committed "LPU64"\n", imp->imp_obd->obd_name, imp->imp_peer_committed_transno); EXIT; return; } CDEBUG(D_RPCTRACE, "%s: committing for last_committed "LPU64" gen %d\n", imp->imp_obd->obd_name, imp->imp_peer_committed_transno, imp->imp_generation); imp->imp_last_transno_checked = imp->imp_peer_committed_transno; imp->imp_last_generation_checked = imp->imp_generation; list_for_each_safe(tmp, saved, &imp->imp_replay_list) { req = list_entry(tmp, struct ptlrpc_request, rq_replay_list); /* XXX ok to remove when 1357 resolved - rread 05/29/03 */ LASSERT(req != last_req); last_req = req; if (req->rq_import_generation < imp->imp_generation) { DEBUG_REQ(D_RPCTRACE, req, "free request with old gen"); GOTO(free_req, 0); } if (req->rq_replay) { DEBUG_REQ(D_RPCTRACE, req, "keeping (FL_REPLAY)"); continue; } /* not yet committed */ if (req->rq_transno > imp->imp_peer_committed_transno) { DEBUG_REQ(D_RPCTRACE, req, "stopping search"); break; } DEBUG_REQ(D_RPCTRACE, req, "commit (last_committed "LPU64")", imp->imp_peer_committed_transno); free_req: spin_lock(&req->rq_lock); req->rq_replay = 0; spin_unlock(&req->rq_lock); if (req->rq_commit_cb != NULL) req->rq_commit_cb(req); list_del_init(&req->rq_replay_list); __ptlrpc_req_finished(req, 1); } EXIT; return; } void ptlrpc_cleanup_client(struct obd_import *imp) { ENTRY; EXIT; return; } void ptlrpc_resend_req(struct ptlrpc_request *req) { DEBUG_REQ(D_HA, req, "going to resend"); lustre_msg_set_handle(req->rq_reqmsg, &(struct lustre_handle){ 0 }); req->rq_status = -EAGAIN; spin_lock(&req->rq_lock); req->rq_resend = 1; req->rq_net_err = 0; req->rq_timedout = 0; if (req->rq_bulk) { __u64 old_xid = req->rq_xid; /* ensure previous bulk fails */ req->rq_xid = ptlrpc_next_xid(); CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n", old_xid, req->rq_xid); } ptlrpc_client_wake_req(req); spin_unlock(&req->rq_lock); } /* XXX: this function and rq_status are currently unused */ void ptlrpc_restart_req(struct ptlrpc_request *req) { DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request"); req->rq_status = -ERESTARTSYS; spin_lock(&req->rq_lock); req->rq_restart = 1; req->rq_timedout = 0; ptlrpc_client_wake_req(req); spin_unlock(&req->rq_lock); } static int expired_request(void *data) { struct ptlrpc_request *req = data; ENTRY; /* * Some failure can suspend regular timeouts. */ if (ptlrpc_check_suspend()) RETURN(1); /* * Deadline may have changed with an early reply. */ if (req->rq_deadline > cfs_time_current_sec()) RETURN(1); RETURN(ptlrpc_expire_one_request(req, 0)); } static void interrupted_request(void *data) { struct ptlrpc_request *req = data; DEBUG_REQ(D_HA, req, "request interrupted"); spin_lock(&req->rq_lock); req->rq_intr = 1; spin_unlock(&req->rq_lock); } struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req) { ENTRY; atomic_inc(&req->rq_refcount); RETURN(req); } void ptlrpc_retain_replayable_request(struct ptlrpc_request *req, struct obd_import *imp) { struct list_head *tmp; LASSERT_SPIN_LOCKED(&imp->imp_lock); /* clear this for new requests that were resent as well as resent replayed requests. */ lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT); /* don't re-add requests that have been replayed */ if (!list_empty(&req->rq_replay_list)) return; lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY); LASSERT(imp->imp_replayable); /* Balanced in ptlrpc_free_committed, usually. */ ptlrpc_request_addref(req); list_for_each_prev(tmp, &imp->imp_replay_list) { struct ptlrpc_request *iter = list_entry(tmp, struct ptlrpc_request, rq_replay_list); /* We may have duplicate transnos if we create and then * open a file, or for closes retained if to match creating * opens, so use req->rq_xid as a secondary key. * (See bugs 684, 685, and 428.) * XXX no longer needed, but all opens need transnos! */ if (iter->rq_transno > req->rq_transno) continue; if (iter->rq_transno == req->rq_transno) { LASSERT(iter->rq_xid != req->rq_xid); if (iter->rq_xid > req->rq_xid) continue; } list_add(&req->rq_replay_list, &iter->rq_replay_list); return; } list_add_tail(&req->rq_replay_list, &imp->imp_replay_list); } int ptlrpc_queue_wait(struct ptlrpc_request *req) { int rc = 0; int brc; struct l_wait_info lwi; struct obd_import *imp = req->rq_import; cfs_duration_t timeout = CFS_TICK; long timeoutl; ENTRY; LASSERT(req->rq_set == NULL); LASSERT(!req->rq_receiving_reply); /* for distributed debugging */ lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid()); LASSERT(imp->imp_obd != NULL); CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc " "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(), imp->imp_obd->obd_uuid.uuid, lustre_msg_get_status(req->rq_reqmsg), req->rq_xid, libcfs_nid2str(imp->imp_connection->c_peer.nid), lustre_msg_get_opc(req->rq_reqmsg)); /* Mark phase here for a little debug help */ ptlrpc_rqphase_move(req, RQ_PHASE_RPC); spin_lock(&imp->imp_lock); req->rq_import_generation = imp->imp_generation; restart: if (ptlrpc_import_delay_req(imp, req, &rc)) { list_del_init(&req->rq_list); list_add_tail(&req->rq_list, &imp->imp_delayed_list); atomic_inc(&imp->imp_inflight); spin_unlock(&imp->imp_lock); DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%s != %s)", cfs_curproc_comm(), ptlrpc_import_state_name(req->rq_send_state), ptlrpc_import_state_name(imp->imp_state)); lwi = LWI_INTR(interrupted_request, req); rc = l_wait_event(req->rq_reply_waitq, (req->rq_send_state == imp->imp_state || req->rq_err || req->rq_intr), &lwi); DEBUG_REQ(D_HA, req, "\"%s\" awake: (%s == %s or %d/%d == 1)", cfs_curproc_comm(), ptlrpc_import_state_name(imp->imp_state), ptlrpc_import_state_name(req->rq_send_state), req->rq_err, req->rq_intr); spin_lock(&imp->imp_lock); list_del_init(&req->rq_list); atomic_dec(&imp->imp_inflight); if (req->rq_err) { /* rq_status was set locally */ rc = -EIO; } else if (req->rq_intr) { rc = -EINTR; } else if (req->rq_no_resend) { spin_unlock(&imp->imp_lock); GOTO(out, rc = -ETIMEDOUT); } else { GOTO(restart, rc); } } if (rc != 0) { spin_unlock(&imp->imp_lock); req->rq_status = rc; // XXX this ok? GOTO(out, rc); } if (req->rq_resend) { lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT); if (req->rq_bulk != NULL) { ptlrpc_unregister_bulk (req); /* bulk requests are supposed to be * idempotent, so we are free to bump the xid * here, which we need to do before * registering the bulk again (bug 6371). * print the old xid first for sanity. */ DEBUG_REQ(D_HA, req, "bumping xid for bulk: "); req->rq_xid = ptlrpc_next_xid(); } DEBUG_REQ(D_HA, req, "resending: "); } /* XXX this is the same as ptlrpc_set_wait */ LASSERT(list_empty(&req->rq_list)); list_add_tail(&req->rq_list, &imp->imp_sending_list); atomic_inc(&imp->imp_inflight); spin_unlock(&imp->imp_lock); rc = sptlrpc_req_refresh_ctx(req, 0); if (rc) { if (req->rq_err) { /* we got fatal ctx refresh error, directly jump out * thus we can pass back the actual error code. */ spin_lock(&imp->imp_lock); list_del_init(&req->rq_list); spin_unlock(&imp->imp_lock); CERROR("Failed to refresh ctx of req %p: %d\n", req, rc); GOTO(out, rc); } /* simulating we got error during send rpc */ goto after_send; } rc = ptl_send_rpc(req, 0); if (rc) DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc); repeat: timeoutl = req->rq_deadline - cfs_time_current_sec(); timeout = (timeoutl <= 0 || rc) ? CFS_TICK : cfs_time_seconds(timeoutl); DEBUG_REQ(D_NET, req, "-- sleeping for "CFS_DURATION_T" ticks", timeout); lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request, req); brc = l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi); if (brc == -ETIMEDOUT && ((req->rq_deadline > cfs_time_current_sec()) || ptlrpc_check_and_wait_suspend(req))) goto repeat; after_send: CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:opc " "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(), imp->imp_obd->obd_uuid.uuid, lustre_msg_get_status(req->rq_reqmsg), req->rq_xid, libcfs_nid2str(imp->imp_connection->c_peer.nid), lustre_msg_get_opc(req->rq_reqmsg)); /* If the reply was received normally, this just grabs the spinlock * (ensuring the reply callback has returned), sees that * req->rq_receiving_reply is clear and returns. */ ptlrpc_unregister_reply(req, 0); spin_lock(&imp->imp_lock); list_del_init(&req->rq_list); atomic_dec(&imp->imp_inflight); spin_unlock(&imp->imp_lock); if (req->rq_err) { DEBUG_REQ(D_RPCTRACE, req, "err rc=%d status=%d", rc, req->rq_status); GOTO(out, rc = rc ? rc : -EIO); } if (req->rq_intr) { /* Should only be interrupted if we timed out. */ if (!req->rq_timedout) DEBUG_REQ(D_ERROR, req, "rq_intr set but rq_timedout not"); GOTO(out, rc = -EINTR); } /* Resend if we need to */ if (req->rq_resend) { /* ...unless we were specifically told otherwise. */ if (req->rq_no_resend) GOTO(out, rc = -ETIMEDOUT); spin_lock(&imp->imp_lock); goto restart; } if (req->rq_timedout) { /* non-recoverable timeout */ GOTO(out, rc = -ETIMEDOUT); } if (!ptlrpc_client_replied(req)) { /* How can this be? -eeb */ DEBUG_REQ(D_ERROR, req, "!rq_replied: "); LBUG(); GOTO(out, rc = req->rq_status); } rc = after_reply(req); /* NB may return +ve success rc */ if (req->rq_resend) { spin_lock(&imp->imp_lock); goto restart; } out: if (req->rq_bulk != NULL) { if (rc >= 0) { /* success so far. Note that anything going wrong * with bulk now, is EXTREMELY strange, since the * server must have believed that the bulk * tranferred OK before she replied with success to * me. */ lwi = LWI_TIMEOUT(timeout, NULL, NULL); brc = l_wait_event(req->rq_reply_waitq, !ptlrpc_bulk_active(req->rq_bulk), &lwi); LASSERT(brc == 0 || brc == -ETIMEDOUT); if (brc != 0) { LASSERT(brc == -ETIMEDOUT); DEBUG_REQ(D_ERROR, req, "bulk timed out"); rc = brc; } else if (!req->rq_bulk->bd_success) { DEBUG_REQ(D_ERROR, req, "bulk transfer failed"); rc = -EIO; } } if (rc < 0) ptlrpc_unregister_bulk (req); } LASSERT(!req->rq_receiving_reply); ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET); cfs_waitq_signal(&imp->imp_recovery_waitq); RETURN(rc); } struct ptlrpc_replay_async_args { int praa_old_state; int praa_old_status; }; static int ptlrpc_replay_interpret(const struct lu_env *env, struct ptlrpc_request *req, void * data, int rc) { struct ptlrpc_replay_async_args *aa = data; struct obd_import *imp = req->rq_import; ENTRY; atomic_dec(&imp->imp_replay_inflight); if (!ptlrpc_client_replied(req)) { CERROR("request replay timed out, restarting recovery\n"); GOTO(out, rc = -ETIMEDOUT); } if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR && (lustre_msg_get_status(req->rq_repmsg) == -ENOTCONN || lustre_msg_get_status(req->rq_repmsg) == -ENODEV)) GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg)); /* The transno had better not change over replay. */ LASSERT(lustre_msg_get_transno(req->rq_reqmsg) == lustre_msg_get_transno(req->rq_repmsg)); DEBUG_REQ(D_HA, req, "got rep"); /* let the callback do fixups, possibly including in the request */ if (req->rq_replay_cb) req->rq_replay_cb(req); if (ptlrpc_client_replied(req) && lustre_msg_get_status(req->rq_repmsg) != aa->praa_old_status) { DEBUG_REQ(D_ERROR, req, "status %d, old was %d", lustre_msg_get_status(req->rq_repmsg), aa->praa_old_status); } else { /* Put it back for re-replay. */ lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status); } /* * Errors while replay can set transno to 0, but * imp_last_replay_transno shouldn't be set to 0 anyway */ if (req->rq_transno > 0) { spin_lock(&imp->imp_lock); LASSERT(req->rq_transno <= imp->imp_last_replay_transno); imp->imp_last_replay_transno = req->rq_transno; spin_unlock(&imp->imp_lock); } else CERROR("Transno is 0 during replay!\n"); /* continue with recovery */ rc = ptlrpc_import_recovery_state_machine(imp); out: req->rq_send_state = aa->praa_old_state; if (rc != 0) /* this replay failed, so restart recovery */ ptlrpc_connect_import(imp, NULL); RETURN(rc); } int ptlrpc_replay_req(struct ptlrpc_request *req) { struct ptlrpc_replay_async_args *aa; ENTRY; LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY); /* Not handling automatic bulk replay yet (or ever?) */ LASSERT(req->rq_bulk == NULL); LASSERT (sizeof (*aa) <= sizeof (req->rq_async_args)); aa = ptlrpc_req_async_args(req); memset(aa, 0, sizeof *aa); /* Prepare request to be resent with ptlrpcd */ aa->praa_old_state = req->rq_send_state; req->rq_send_state = LUSTRE_IMP_REPLAY; req->rq_phase = RQ_PHASE_NEW; req->rq_next_phase = RQ_PHASE_UNDEFINED; if (req->rq_repmsg) aa->praa_old_status = lustre_msg_get_status(req->rq_repmsg); req->rq_status = 0; req->rq_interpret_reply = ptlrpc_replay_interpret; /* Readjust the timeout for current conditions */ ptlrpc_at_set_req_timeout(req); DEBUG_REQ(D_HA, req, "REPLAY"); atomic_inc(&req->rq_import->imp_replay_inflight); ptlrpc_request_addref(req); /* ptlrpcd needs a ref */ ptlrpcd_add_req(req, PSCOPE_OTHER); RETURN(0); } void ptlrpc_abort_inflight(struct obd_import *imp) { struct list_head *tmp, *n; ENTRY; /* Make sure that no new requests get processed for this import. * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing * this flag and then putting requests on sending_list or delayed_list. */ spin_lock(&imp->imp_lock); /* XXX locking? Maybe we should remove each request with the list * locked? Also, how do we know if the requests on the list are * being freed at this time? */ list_for_each_safe(tmp, n, &imp->imp_sending_list) { struct ptlrpc_request *req = list_entry(tmp, struct ptlrpc_request, rq_list); DEBUG_REQ(D_RPCTRACE, req, "inflight"); spin_lock (&req->rq_lock); if (req->rq_import_generation < imp->imp_generation) { req->rq_err = 1; req->rq_status = -EINTR; ptlrpc_client_wake_req(req); } spin_unlock (&req->rq_lock); } list_for_each_safe(tmp, n, &imp->imp_delayed_list) { struct ptlrpc_request *req = list_entry(tmp, struct ptlrpc_request, rq_list); DEBUG_REQ(D_RPCTRACE, req, "aborting waiting req"); spin_lock (&req->rq_lock); if (req->rq_import_generation < imp->imp_generation) { req->rq_err = 1; req->rq_status = -EINTR; ptlrpc_client_wake_req(req); } spin_unlock (&req->rq_lock); } /* Last chance to free reqs left on the replay list, but we * will still leak reqs that haven't committed. */ if (imp->imp_replayable) ptlrpc_free_committed(imp); spin_unlock(&imp->imp_lock); EXIT; } void ptlrpc_abort_set(struct ptlrpc_request_set *set) { struct list_head *tmp, *n; LASSERT(set != NULL); list_for_each_safe(tmp, n, &set->set_requests) { struct ptlrpc_request *req = list_entry(tmp, struct ptlrpc_request, rq_set_chain); spin_lock (&req->rq_lock); if (req->rq_phase != RQ_PHASE_RPC) { spin_unlock (&req->rq_lock); continue; } req->rq_err = 1; req->rq_status = -EINTR; ptlrpc_client_wake_req(req); spin_unlock (&req->rq_lock); } } static __u64 ptlrpc_last_xid; static spinlock_t ptlrpc_last_xid_lock; /* Initialize the XID for the node. This is common among all requests on * this node, and only requires the property that it is monotonically * increasing. It does not need to be sequential. Since this is also used * as the RDMA match bits, it is important that a single client NOT have * the same match bits for two different in-flight requests, hence we do * NOT want to have an XID per target or similar. * * To avoid an unlikely collision between match bits after a client reboot * (which would cause old to be delivered into the wrong buffer) we initialize * the XID based on the current time, assuming a maximum RPC rate of 1M RPC/s. * If the time is clearly incorrect, we instead use a 62-bit random number. * In the worst case the random number will overflow 1M RPCs per second in * 9133 years, or permutations thereof. */ #define YEAR_2004 (1ULL << 30) void ptlrpc_init_xid(void) { time_t now = cfs_time_current_sec(); spin_lock_init(&ptlrpc_last_xid_lock); if (now < YEAR_2004) { ll_get_random_bytes(&ptlrpc_last_xid, sizeof(ptlrpc_last_xid)); ptlrpc_last_xid >>= 2; ptlrpc_last_xid |= (1ULL << 61); } else { ptlrpc_last_xid = (now << 20); } } __u64 ptlrpc_next_xid(void) { __u64 tmp; spin_lock(&ptlrpc_last_xid_lock); tmp = ++ptlrpc_last_xid; spin_unlock(&ptlrpc_last_xid_lock); return tmp; } __u64 ptlrpc_sample_next_xid(void) { #if BITS_PER_LONG == 32 /* need to avoid possible word tearing on 32-bit systems */ __u64 tmp; spin_lock(&ptlrpc_last_xid_lock); tmp = ptlrpc_last_xid + 1; spin_unlock(&ptlrpc_last_xid_lock); return tmp; #else /* No need to lock, since returned value is racy anyways */ return ptlrpc_last_xid + 1; #endif } EXPORT_SYMBOL(ptlrpc_sample_next_xid);